package project.youkumenu.customview;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.CycleInterpolator;
import android.view.animation.TranslateAnimation;

import project.youkumenu.R;

/**
 * Created by lgs on 2018/3/7.
 */

public class ClearWriteEditText extends android.support.v7.widget.AppCompatEditText implements TextWatcher, View.OnFocusChangeListener {

    /**
     * 删除按钮的引用
     */
    private Drawable mClearDrawable;

    public ClearWriteEditText(Context context) {
        this(context, null);
    }

    public ClearWriteEditText(Context context, AttributeSet attrs) {
        //这里构造方法也很重要，不加这个很多属性不能再XML里面定义
        this(context, attrs, android.R.attr.editTextStyle);
    }

    public ClearWriteEditText(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    /**
     * getIntrinsicWidth()、getIntrinsicHeight()得到Drawable固有的宽度和高度
     * getIntrinsicWidth()和getIntrinsicHeight()返回的宽高应该是dp为单位的哦。
     * getWidth()在onCreate时获取的宽度是0，获取的宽度不准确
     */
    private void init() {
        mClearDrawable = getResources().getDrawable(R.drawable.et_delete);
        mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight());
        //默认设置隐藏
        setClearIconVisible(false);
        this.setOnFocusChangeListener(this);
        this.addTextChangedListener(this);
    }

    /**
     * 设置清除图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去
     *
     * @param isVisible
     */
    private void setClearIconVisible(boolean isVisible) {
        Drawable right = isVisible ? mClearDrawable : null;
        setCompoundDrawables(getCompoundDrawables()[0],
                getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
    }

    /**
     * 当输入框里面内容发生变化的时候回调的方法
     */
    @Override
    public void onTextChanged(CharSequence s, int start, int count, int after) {
        setClearIconVisible(s.length() > 0);
    }

    /**
     * 因为我们不能直接给EditText设置点击事件，所以我们用记住我们按下的位置来模拟点击事件
     * 当我们按下的位置 在  EditText的宽度 - 图标到控件右边的间距 - 图标的宽度  和
     * EditText的宽度 - 图标到控件右边的间距之间我们就算点击了图标，竖直方向没有考虑
     */
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (null != getCompoundDrawables()[2]) {
            if (event.getAction() == MotionEvent.ACTION_UP) {
                boolean touchable = event.getX() > (getWidth() - getPaddingRight() - mClearDrawable.getIntrinsicWidth())
                        && (event.getX() < (getWidth() - getPaddingRight()));

                if (touchable)
                    this.setText("");
            }
        }
        return super.onTouchEvent(event);
    }

    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
    }

    @Override
    public void afterTextChanged(Editable editable) {

    }

    /**
     * 当ClearEditText焦点发生变化的时候，判断里面字符串长度设置清除图标的显示与隐藏
     */
    @Override
    public void onFocusChange(View view, boolean hasFocus) {
        if (hasFocus) {
            setClearIconVisible(getText().length() > 0);
        } else {
            setClearIconVisible(false);
        }
    }

    /**
     * 设置晃动动画
     */
    public void setShakeAnimation() {
        this.startAnimation(shakeAnimation(3));
    }

    /**
     * 晃动动画
     *
     * @param counts 半秒钟晃动多少下
     * @return
     */
    private Animation shakeAnimation(int counts) {
        Animation translateAnimation = new TranslateAnimation(0, 10, 0, 0);
        // Interpolator 被用来修饰动画效果，定义动画的变化率，
        // 可以使存在的动画效果accelerated(加速)，decelerated(减速),
        // repeated(重复),bounced(弹跳)等。
        translateAnimation.setInterpolator(new CycleInterpolator(counts));
        translateAnimation.setDuration(500);
        return translateAnimation;
    }

    public Drawable getClearDrawable() {
        return mClearDrawable;
    }

    public void setClearDrawable(Drawable drawable) {
        this.mClearDrawable = drawable;
    }

}
